From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CDB00C10F14 for ; Thu, 3 Oct 2019 15:56:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 928C920830 for ; Thu, 3 Oct 2019 15:56:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570118163; bh=1WihBIwZqxOoQ9h+iW9Xz0I6UF1K+HnwcMm6vQosSuA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=C7HCFFdgxmM7ELFSrOcbrJMuZ8UH/AAXSG9jJUChk4Z6iOHna0/PXhB2ROMvuP+JD jNruj/eFnCLySf+nS7BdYPuOYIAtuhP0WTflvsBJMV5EVIjP5uikLsYn4IR/g++Tmx g1GCBqAnj8VuOd0MyJUVixh1GJJzV1aX2nnbQoqQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730465AbfJCP4D (ORCPT ); Thu, 3 Oct 2019 11:56:03 -0400 Received: from mail.kernel.org ([198.145.29.99]:37654 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730433AbfJCP4A (ORCPT ); Thu, 3 Oct 2019 11:56:00 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id CE15420700; Thu, 3 Oct 2019 15:55:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570118159; bh=1WihBIwZqxOoQ9h+iW9Xz0I6UF1K+HnwcMm6vQosSuA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ES8obvDBbPCP4ajnEkQxMH9u2YiSv4rkO4Q+75MVhS30305zdg8IGZWLbkmEeBbae gCBqVp1j8ueytqKthv7TVK+3yUR6YDxq1aufQrnxc7Ao3Rrq0LKHqLLVtCxVbhdbPV 6i23UzENXjk2C2Ght7fZxf6el8SCABZqaSMFuW28= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Yu Wang , Johannes Berg , Sasha Levin Subject: [PATCH 4.4 12/99] mac80211: handle deauthentication/disassociation from TDLS peer Date: Thu, 3 Oct 2019 17:52:35 +0200 Message-Id: <20191003154259.021187870@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191003154252.297991283@linuxfoundation.org> References: <20191003154252.297991283@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Yu Wang [ Upstream commit 79c92ca42b5a3e0ea172ea2ce8df8e125af237da ] When receiving a deauthentication/disassociation frame from a TDLS peer, a station should not disconnect the current AP, but only disable the current TDLS link if it's enabled. Without this change, a TDLS issue can be reproduced by following the steps as below: 1. STA-1 and STA-2 are connected to AP, bidirection traffic is running between STA-1 and STA-2. 2. Set up TDLS link between STA-1 and STA-2, stay for a while, then teardown TDLS link. 3. Repeat step #2 and monitor the connection between STA and AP. During the test, one STA may send a deauthentication/disassociation frame to another, after TDLS teardown, with reason code 6/7, which means: Class 2/3 frame received from nonassociated STA. On receive this frame, the receiver STA will disconnect the current AP and then reconnect. It's not a expected behavior, purpose of this frame should be disabling the TDLS link, not the link with AP. Cc: stable@vger.kernel.org Signed-off-by: Yu Wang Signed-off-by: Johannes Berg Signed-off-by: Sasha Levin --- net/mac80211/ieee80211_i.h | 3 +++ net/mac80211/mlme.c | 12 +++++++++++- net/mac80211/tdls.c | 23 +++++++++++++++++++++++ 3 files changed, 37 insertions(+), 1 deletion(-) diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h index 7b271f3ded6ba..72f76da88912d 100644 --- a/net/mac80211/ieee80211_i.h +++ b/net/mac80211/ieee80211_i.h @@ -2059,6 +2059,9 @@ void ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy, const u8 *addr); void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata); void ieee80211_tdls_chsw_work(struct work_struct *wk); +void ieee80211_tdls_handle_disconnect(struct ieee80211_sub_if_data *sdata, + const u8 *peer, u16 reason); +const char *ieee80211_get_reason_code_string(u16 reason_code); extern const struct ethtool_ops ieee80211_ethtool_ops; diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c index 3daf3ae4003be..24eec3cb922d1 100644 --- a/net/mac80211/mlme.c +++ b/net/mac80211/mlme.c @@ -2743,7 +2743,7 @@ static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata, #define case_WLAN(type) \ case WLAN_REASON_##type: return #type -static const char *ieee80211_get_reason_code_string(u16 reason_code) +const char *ieee80211_get_reason_code_string(u16 reason_code) { switch (reason_code) { case_WLAN(UNSPECIFIED); @@ -2808,6 +2808,11 @@ static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata, if (len < 24 + 2) return; + if (!ether_addr_equal(mgmt->bssid, mgmt->sa)) { + ieee80211_tdls_handle_disconnect(sdata, mgmt->sa, reason_code); + return; + } + if (ifmgd->associated && ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) { const u8 *bssid = ifmgd->associated->bssid; @@ -2857,6 +2862,11 @@ static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata, reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code); + if (!ether_addr_equal(mgmt->bssid, mgmt->sa)) { + ieee80211_tdls_handle_disconnect(sdata, mgmt->sa, reason_code); + return; + } + sdata_info(sdata, "disassociated from %pM (Reason: %u=%s)\n", mgmt->sa, reason_code, ieee80211_get_reason_code_string(reason_code)); diff --git a/net/mac80211/tdls.c b/net/mac80211/tdls.c index c9eeb3f128085..ce2ece4243849 100644 --- a/net/mac80211/tdls.c +++ b/net/mac80211/tdls.c @@ -1963,3 +1963,26 @@ void ieee80211_tdls_chsw_work(struct work_struct *wk) } rtnl_unlock(); } + +void ieee80211_tdls_handle_disconnect(struct ieee80211_sub_if_data *sdata, + const u8 *peer, u16 reason) +{ + struct ieee80211_sta *sta; + + rcu_read_lock(); + sta = ieee80211_find_sta(&sdata->vif, peer); + if (!sta || !sta->tdls) { + rcu_read_unlock(); + return; + } + rcu_read_unlock(); + + tdls_dbg(sdata, "disconnected from TDLS peer %pM (Reason: %u=%s)\n", + peer, reason, + ieee80211_get_reason_code_string(reason)); + + ieee80211_tdls_oper_request(&sdata->vif, peer, + NL80211_TDLS_TEARDOWN, + WLAN_REASON_TDLS_TEARDOWN_UNREACHABLE, + GFP_ATOMIC); +} -- 2.20.1